The invention discloses a code modulation method based on complete response CPM (continuous phase modulation) and a Turbo product code, and the method can be used for solving the problems of the requirement of iterative decoding of inner-outer codes, difficulty in seeking for the optimum outer code and the fixing of modulation parameters in the prior art. The the method provided by the invention is implemented through the following specific steps: (1) initializing a Turbo product code encoder; (2) reading in signal sequence; (3) decoding the Turbo product code; (4) interweaving randomly; (5) carrying out symbol mapping; (6) carrying out non-recursion continuous phase decoding; (7) carrying out memoryless modulation. According to the invention, the error bit ratio can be achieved well without iterative decoding between the inner-outer codes, the code delay is reduced, the complexity of programming for a decoding algorithm on a programmable device is reduced, and the outer code design is simplified; and the non-recursion continuous phase modulation parameters provided by the invention are flexible and variable, and different requirements on power efficiency, frequency spectrum efficiency and reliability of different communication systems can be satisfied.